March 29, 1980
Episode 1 of ? season 4 premiered on March 29, 1980
April 5, 1980
Episode 2 of ? season 4 premiered on April 5, 1980
April 12, 1980
Episode 3 of ? season 4 premiered on April 12, 1980
April 19, 1980
Episode 4 of ? season 4 premiered on April 19, 1980
April 26, 1980
Episode 5 of ? season 4 premiered on April 26, 1980
May 3, 1980
Episode 6 of ? season 4 premiered on May 3, 1980
May 10, 1980
Episode 7 of ? season 4 premiered on May 10, 1980
May 17, 1980
Episode 8 of ? season 4 premiered on May 17, 1980